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Previous issue date: 2016-08-04 / Honey and propolis are produced by bees from the nectar and sap collected from plants. In the process, the phenolic compounds derived from secondary metabolism of plants are incorporated into the products mentioned. Honey and propolis samples from multiple regions have been characterized and phenolic compounds can be divided into: hydroxybenzoic acid derivatives, hydroxycinnamic acid derivatives, flavonoids and glycosylated flavonoids. In the literature, there is no consensus among the authors about the values for in vitro antioxidant activity. Moreover, these methods do not represent physiological conditions such as concentration of substrates and metabolites interaction. The yeast Saccharomyces cerevisiae is an alternative tool for a biological assays, since it is similar to mammalian cells. The main goal of this study is to compare the antioxidant potential of different phenolic compounds classes using representatives morin, rutin, chlorogenic acid and syringic acid in control strains (BY4741) and mutant (?sod1 and ?gsh1) of S. cerevisiae. They were evaluated in dose-dependent toxicity, stress tolerance, and lipid peroxidation. All tested phenolic compounds were effective in reducing intracellular oxidative damage, especially the chlorogenic acid in the control strain. When compared to stressed cells, it promoted 75% increase on cell survival rates, compared with 57% on average for the other treatments; and 60% decrease in levels of lipid peroxidation, compared to reductions close to 47% with other treatments. In mutant strains, all compounds presented similar results. Thus, two components of the class hydroxycinnamic acid, caffeic acid and caffeic acid phenethyl ester (CAPE) were tested comparatively. Both acted as an antioxidant in S. cerevisiae, however CAPE was the most toxic substance promoting the most significant increase on reduced glutathione levels among hydroxycinnamic derivatives. This result supports some related research that claims phenolic compounds protectection is related to activation of the antioxidant system as xenobiotic action of these substances / O mel e a pr?polis s?o produzidos por abelhas, a partir da coleta de n?ctar e seiva das plantas. No processo, os compostos fen?licos oriundos do metabolismo secund?rio dos vegetais s?o incorporados aos produtos mencionados. Amostras de mel e pr?polis de diferentes regi?es foram caracterizadas e o conte?do de compostos fen?licos pode ser dividido em: derivados do ?cido hidroxibenzoico, derivados do ?cido hidroxicin?mico, flavonoides e flavonoides glicosilados. Na literatura, valores de atividade antioxidante in vitro descritos divergem consideravelmente entre os autores. Al?m disso, os m?todos in vitro (DPPH, ABTS, FRAPP, dentre outros) n?o representam condi??es fisiol?gicas como concentra??o de substratos e intera??o de metab?litos. A levedura Saccharomyces cerevisie ? uma ferramenta para ensaio biol?gico, uma vez que apresenta elevada semelhan?a com c?lulas de mam?feros superiores no sistema de defesa antioxidante. O objetivo deste trabalho foi comparar o potencial antioxidante de diferentes classes de compostos fen?licos, utilizando os representantes morina, rutina, ?cido sir?ngico e clorog?nico em cepas controle (BY4741) e mutantes (?sod1 e ?gsh1) de S. cerevisiae. Foram avaliados toxidez dose-dependente, toler?ncia ao estresse e peroxida??o lip?dica. Todos os compostos fen?licos testados foram efetivos em reduzir danos oxidativos intracelulares, com destaque para o ?cido clorog?nico na cepa controle. Quando comparado ?s c?lulas estressadas, este promoveu aumentos de 75% de sobreviv?ncia, contra 57% em m?dia dos demais tratamentos; e diminui??o de 60% em n?veis de peroxida??o lip?dica, contra redu??o pr?xima a 47% dos demais tratamentos. Nas cepas mutantes, todas as subst?ncias tiveram resultados semelhantes entre si. Desta forma, outros dois componentes da classe do ?cido hidroxicin?mico, ?cido cafeico e ?ster fenet?lico do ?cido cafeico (CAPE), foram testados comparativamente. Ambos atuaram como antioxidante em S. cerevisiae, entretanto CAPE foi a subst?ncia mais t?xica e tamb?m a que promoveu aumento mais significativo de glutationa reduzida dentre os derivados hidroxicin?micos. Esse resultado corrobora com dados de estudos que apontam que a atividade protetora dos compostos fen?licos est? relacionada a ativa??o do sistema antioxidante por a??o xenobi?tica dessas subst?ncias
| Identifer | oai:union.ndltd.org:IBICT/oai:localhost:jspui/1626 |
| Date | 04 August 2016 |
| Creators | Prud?ncio, Edlene Ribeiro |
| Contributors | Riger, Cristiano Jorge, Salles, Cristiane Martins Cardoso de, Barbosa, Maria Ivone Martins Jacintho, Pereira, Marcos Dias |
| Publisher | Universidade Federal Rural do Rio de Janeiro, Programa de P?s-Gradua??o em Qu?mica, UFRRJ, Brasil, Instituto de Ci?ncias Exatas |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Format | application/pdf |
| Source | reponame:Biblioteca Digital de Teses e Dissertações da UFRRJ, instname:Universidade Federal Rural do Rio de Janeiro, instacron:UFRRJ |
| Rights | info:eu-repo/semantics/openAccess |
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